So true. But the rules...

If you limit the throttle from opening during the noise check and after that release the switch and fly with full power you didn't have full power on the measurement. There has been at least one disquilifying I have heard, not sure when that was. If you heat the engine just a bit more and then go to the check as routine you loose 15s of time but you clearly have full power as the rules say you must have. I heard the guy who got disqualified was seen to use switch or was it so that they saw his throttle servo travel went bigger after the measurement. Anyway a noise kill switch is prohibited in competitions.

It is a trick you can use if you have to, othewise I wouldn't do it. My plane is just under 94dB anyway, I personally hate all kinds of tricks and worrying about the noise.

A well prepared plane will pass, no doubt about that, is there? Let's concentrate on that.